Roofing-tile press



July 15". 1924. 1,501,535

N. FREDRIKSSON ET AL ROOFING TILE PRESS Filed .my 224, 1922 :s sheets-'sheet 1 July 15 1924.

N. FREDRlKssoN ET AL ROOFING TILE PRESS 5 Sheets-Shee't 2 Filed July 24, 1922 NILS FREDRIKSSON, OF STOCKHOLM, AND HERMAN ALFRED EDV'ARD HRSTEDT ANN OF-ICE.

KARL GS'IAF LINDBERG, OF SVEDALA, SWEDEN', ASSIGNORS TO AKTIEBOLAGET ABJ'RN ANDERSON, OF SVEDALA, SWEDEN, A COMPANY OF SWEDEN.

ROOFING-TILE PRESS.

Application filed July 24, 1922.

usually carried on in suchl manner that clay pieces, or so called blocks, of such size that each block is suflicient for the `moulding of one, roofing-tile, are pressed between moulding members f movable towards and away from one another, one of said members, the plunger or press head, being as a rule movable vertically against the other member,

the lower mould, which latter is capable ofbeingturned, for the -purpose of delivering the moulded tiles on aboard or the like, The movement of the press head and mould is often effected by mechanical power in so called rooingtile presses, of which there are quite a number of constructions which operate more or less automatically. No such heretofore known construction, however, has proved to be quite satisfactory. The most perfect presses are probably the socalled revolving presses in which a numberv-usually five-of lower moulds are secured to a prism having the same number of sides as the number of lower moulds, and which prism is rotated step by step around its horizontal axis so that one lower mould after another is moved to pressing position below the press head which is movable up and down. Also such revolving presses, however, have several serious disadvantages. The lower mould on which the clay bod is to be placed, occupies vat the moment w en such positioning is to be effected, always a more or less inclinedl position owing to which the clay body will not rest securely on Athe mould unless the Aworkman who places the bodies, holds the body on the lower mould, with his hand until during the subsequent rotationof the prism the lower mould has reached approximately horizontal position. It will thus easily happen that the workman keeps his hand on the body a moment too long so that he gets his .hand pinched. To avoid such accidents Serial No. 577,115.'

more or less complete safety devices have been provided, all of which, however, have entailed further .disadvantages Furthermore, `it`is laY disadvantage that the lower mould from which the pressed roofing-tile shall be removed, does not occupy a position suitable for such removal, and that while being at rest it is rimmovable which renders tetas i it impossible to sliake'the mould in orderl to facilitate the removal.

The present invention refers to a roofingtile press which in respect of automatic op* eration is fully comparable to the revolving presses above described without possessing their disadvantages referred to. The new press^ which, in the well known manner above referred to, isprovided with a verti-y cally movable press head which cooperates with a plurality of lower moulds arranged to be rotated in such manner that they may be moved one after another to pressing position below the press head, is chiefly characterized by this that all lower moulds are rotatable in unison on a vertical shaft for the purpose of moving them in under'the press head, and that each lower-mould is separately rotatable on a horizontal shaft for the purpose of emptying I`the lower moulds. Ir. this vmanner the result is obtained that when placing the clay bodies upon the lower moulds said moulds may always occupy a perfectly horizontal position so that it is unnecessary to hold the bodies by hand, and it will also be possible to shake the moulds for the purpose of facilitating the removal of the pressed tiles, the moulds being free to be rotated when occupying the emptying position. On the other hand when the moulds are in the filling and pressing positions they should of course be `maintained in horizontal position by suitable guides. Y ki' In the accompanying drawings an embodiment of the invention is illustrated by way of example. Fig. l shows a side view of a roofing-tile press according to the invention, and Fig. 2 shows a front viewof the press, and Fig. 3 a top plan view of the same the upper portions being omitted for rendering the drawing clearer. Fig. 4 is a plan view and Fig. 5 is an end view of the guides for the lower moulds. l

' In the upper part of the press frame l a driving shaft 2 is journalled which supports at. its one end two pulleys, one free pulley 3' and one driving pulley 4. A toothed pinion 5 is secured to the other end ofthe shaft 2 and meshes with a larger gear wheel 6 on a shaft 7 parallel with the shaft 2. lAcam disk 8 is secured. .tor the gear wheel 6 said cam disk effecting the turning of the lower moulds in a manner further described here below, and an eccentric disk 9 is secured t0 theshaft 7 and actuates a slide 10 slidable in the frame so that said slidemoves. up' and down. The plunger orpresshead 11r is secured to the lower end ofthe slide 10.

Thepress illustrated in the drawings is provided'. with four lower moulds 12 each ofwhichis rotatable on a horizontal shaft 13.; rFhe 'in-ner ends of saidshaft are securedatoa cross-,shaped table 14 which is rotatable .arounda vertical shaft 15 in the centre of the cross, said shaft being secured tothe frame 1. Referring to Fig. 3 which shows the four lower moulds 12 viewed from above, A denotes the position for filling the lower moulds, B the position for pressingimmediately below the press head which is not shown in` this `figure-C the position for trimming. the moulded roofing-tiles, and D the, position for emptying the lower moulds.. The table 14 with the four lower moulds is rotated step by step in the directionlindicated by-the arrow in Fig.v 3, eachtimel lthrough an angle of 90, so that oneflower mould after another is turned to the pressing position B below the press head. Inorderto effect' said stepby step rotation four pawls 16 are pivoted.I in recesses in the lowerfface of the table 14, said pawls cooperating ywithvradial studs 17 on a drum 18 vlocated-below the table and rotatable on the shaft 15. A chain 19` is partly wound onthe drum, one end of said chain being securedrto the outside of the drum, and the other endof the chain being connected by means ofa rod 2O with one arm 21 of a bell cranklever pivoted on the stud-22- secured to theV frame, the other arm23 of saidy lever carrying a roller24` which is actuated by the cam disk 8 above referred to. A strong spiral spring, not shown in the drawing, is located in the drum 18, said spring turningthe ditumback a quarter of rotation after each operation period and maintainingat-the same time the roller 24 in engagement with the Acam disk 8. The table 14 does vnot'take part in this back-turningV of the drum.

The t lower moulds are .normally main- `tained in the horizontal position shown in Figs. 1e3 with the upper face directed up# wards, partly by an arcuate guide rail 25 rigidly connected with the frame 1, and partly by a few shorter guide rails 26 on which the lower moulds rest during tht` pressing so vthat the shafts 13 will not be subjected to bending stresses during the pressing. As shown in Figs. 3 and 4, however, the guide rail 25 is cut off opposite the emptying position D, so that when the, lower moulds occupy this position, they are capable of turning on their shafts 13 and may thus be turned upside down for the purpose ofbeing emptied, see Figs. 3 and 5. In order to facilitate the turning each lower mould is provided with a handle 27. T.'

is to say half a rotation from the normal position. If the tile does not come loose from the lower mould by merely said mouldl turning upside down, the mould may thus be turned slightly back and afterwards it may be given a slight shock by making the lug 28 on the mould strike against the lug 29 on the table. In thismanner the roof-V ing-tile will easily come loose from the.

lower mould and may be received in the ordinary manner on a board or other suitv able support. Finally, there is secured to each lower mould a roller 30 which, when the emptying is completed and the moulds*` are again put into motion from the empty-v ing position B to the filling position A, will strike against an inclined surface 31 on the end of the guide rail 25 and will thus automatically turn back the mould half a rotation so that when reaching the filling position A it will again occupy-its normal 1f position.

In order to limit the turning movement of the lower moulds in the correct positions so that the lower mould in which pressing is to take place, comes right below the pressv head, there is provided in the frame 1 a counter-weighted arm 32 secured to an oscillatory shaft 33 on the end of which projecting outside the framey a crank pin 34v is secured. Said crank pin is actuated by two oppositely arranged lugs 35 and 36fon the lever arm 21, Fig. 1, so that the locking arm is turned away downwards by the lug` when the arm 21 moves to the left in Fig. 1, and is afterwards again moved by the counter-weight and the lug 35 upwards into the path of the outer end of the next'A shaft 13 when the arm 21 moves b'ackl'to the right in` Fig. 1 and turns the lower/- moulds.

In order lto reduce the force Pnecessary for turning the table 14 with the lower moulds, the table is raised slightly-corresponding to the distance .fr in Fig. 2-befo`re the turn-` ing is initiated, so that the moulds become free from and do not slide on the guide rail 25. -Such raising of the moulds is effected simply by means of the inclined position of t'he pawls 16 shown in Fig. 2, said position being so chosen that at the initial turning of the drum 18 in the direction indicated by the arrow in Fig. 2 when the studs 17 engage the lower ends of the pawls, the studs will lirst raise the table by the intermediary of the pawls, until the table comes to bear against a collar 37 on the shaft 15, and afterwards *the studs will turn the table. When the drum 18 is Yturned back the table and the moulds are again lowered.

The operation of the press will be understood from the above description and the drawing. `The cam disk 8 and the eccentric disk 9 should of course be so set one relatively to the other that the turnin of the table with the lower moulds takes p ace while the press head 11 is raised.I The pro portioned clay bodies are placed on the lower moulds when in the position A, and in view of the fact that in this position as well as during the entire movement between A and B the lower moulds occupy a horizontal position, it is not necessary to keep the clay bodies on the moulds with the hand. The pressing is effected in the position B, and in the position C the pressed roofing-tiles are trimmed either by hand or automatically by means of a suitable cutter which may be rigidly connected with the slide 1() and move up and down simultaneously with the same. Finally, in the position D the lower moulds are emptied which operation is essentially facilitated by the moulds being free to turn in this position, so that, if required, the tiles may be caused to come loose by a slight shaking of the moulds.

We claim:

1. In a roofing-tile press the combination of a vertically movable press head, and a plurality of lower moulds capable of turning in unison around a vertical axis so as to be movable one after the other to pressing position below said press head, each of said lower moulds being separately capable of turningaround a horizontal axis substantially radial and perpendicular to said first named axis.

2. In a roofing-tile press the combination of a vertically movable press head, a plurality of lower moulds capable of turning in unison around a vertical axis so as to be movable one after/'the other to pressing position below said press head, each of said lower molds being separately capable of turning around a horizontal axis substantially radial and perpendicular to said first named axis, and guides for said lower moulds stationary in relation to said moulds and located below said press head and extending so far to one side thereof substantially concentrically with said vertical axis that the lower mould beneath said press head as well as the next lower mould in the direction*v sitionlbelow said press head, each of said lower moulds being separately capable of turning-around a horizontal axis, lugs on said lower moulds, and lugs stationary in relation to said lower moulds and located in such manner that they may be struck by said first named lugs on said lower moulds when rotated around their horizontal axes, for the purpose by such striking of said lugs against one another to facilitate the emptying of said lower moulds.

` 4. In a roofing-tile press the combination of a vertically movable press head, a plurality of lower moulds, a horizontal shaft for each of said lower moulds, a member carrying said horizontal shafts, a vertical shaft for said member located in such relation to said press head that said lower moulds are capable of turning in unison one after the other to pressing position below said press head, driving means for producing a reciprocating vertical movement of said press head, and means connected with said driving means for producing a step by step rotary motion of said member around said vertical shaft in a definite time relation to the vertical movements of said press head.

5. In a roofing-tile press the combination of a vertically movable press head, a plurality of lower moulds, a horizontal shaft for each of said lower moulds, a member carrying said horizontal shafts, a vertical shaft for said member located in such relation to said press head that said lower moulds are capable of turning in unison one after the other to pressing position below said press head, driving means for producing a reciprocating vertical movement of said press head, pawls pivoted to said member, a drum located below said member and rotatable around said vertical shaft, studs on said drum adapted to be engaged by`V said pawls, and means connected with said driving means for producing a rotary motion of said drum around said vertical shaft.

(i. In a roofing-tile press Athe combination of a vertically movable press head, a plurality of lower moulds, a horizontal shaft for each of said lower moulds, a member carrying said horizontal shafts, a vertical shaft for said member located in such relaiton to said press` head that said lower moulds are capable of turning in unison one after the other to pressing position below said press head, driving means for producing a reciprocating vertical movement of sa i cl'plress bead, paWls-vpvotedrto said: mem berg-:L drumloeutedbelow sarda-member and rotatable around said Vertical shaft,v` studs' onxSa-id: drumf adapted: to beengaged by Said pawls; means connected. with. said; driving means .for producing a rotarywmotion of' saldi drum around said Vertical shaft, andglldes for said l'owel1 moulds located-below said. press: head and extendingso f artoV one side thereof that the lower mould# beneath sadf prees head .as f Well: as-:thefnext "lower:y mould 1 iny the' direction orf-rotation o `saCl- Slloweli Lemmon;

moulds: are guided-by saidfguds; said pewls 'Y oeoll-pylngsuch? 1nel1n'edpo`s1t1-on that at the:

initial:tm'nng-o said? dffuneaused by smidi 15 Nus 1 FREDRmssoN. HERMAN, ALERED 1am/zumV HRSTEDT. KARnV-GUSTAF UNDEG; 

